Loom harness mechanism



' Jm 16, 1940. Q 5, BR 2,187,699

LODM HARNESS MECHANISI Filed July 15, 1939 2 Sheets-Sheet 1 Hf e INVENTOR.

CkEL D. Been/N.

BY WM $24M ATTORNEY Jan. 16, 1 940.

c. D. BROWN 2,187,699

- LOOK HARNESS MECHANISI Filed July 15, 1939 2 Sheets-Sheet 2 INVENTOR. CAEL D. 560 H/N.

ATTORNEY.

Patented Jan. 16, 1940 UNITED STATES PATENT OFFICE LOOM HARNESS MECHANISM Carl D.' Brown, Hopedale, Mass., assignor to Draper Corporation, Hopedale, Mass., a corporation of Maine Application July 15, 1939, Serial No. 284,798

9 Claims.

skilled in the art. A later construction, wherein the treadle and fulcrum member comprise a rack and gear, has overcome most of such objections and also provides for adjustment of the fulcrum member longitudinally of the treadles to thereby vary the throw of the treadles. This later construction is satisfactory in most respects, but is subject to somewear and is expensive to manufacture and to repair. a v A principal object of the present invention is to provide a loom having harness frames, harness treadles, and harness cams as aforesaid, a fulcrum member on which a substantially flat surface onthe treadles rests, a fixed stand, and a pin and slot connection between the stand and treadles the slot of which'shall be arcuate with its center substantially coinciding with the fulcrum point of the fulcrum member, to permit and guide pivotal movement of the treadles but a prevent longitudinal movement of the same, whereby such construction shall be simple and cheap to manufacture and shall not be subject to the aforesaid objections.

A further object is to provide a loom having 40 harness frames, harness treadles, harness cams, and a fulcrum member on which fiat longitudinal surfaces of said treadles rest, as aforesaid, and which shall also have adjustable supporting means for adjusting the fulcrummember longithrow of the latter, and guide means spaced from such fulcrum member and guiding the was objectionable for reasons well known to those tudinally of the treadles to thereby adjust thejust the relative throws of the treadles to provide a suitably graduated shed opening.

The foregoing and other objects of the invention are accomplished in the construction illustrated on the accompanying drawings, of which:

Fig. 1 is a view partly in elevation and partly in section, showing a loom having the preferred embodiment of my invention applied thereto;

Fig. 2 is a view partly in plan and partly in section on line 2-2 of Fig. 1 but with parts.

omitted;

Fig. 3 is a diagrammatic View illustrating the operation of said preferred embodiment;

Fig. 4 is a diagrammatic View showing a modifled form of .my invention; and

Fig. 5 is a view of the embodiment of Fig. 1

and 2 but showing certain parts adjusted to a different position.

shaft 3, cam shaft 4, and certain parts of the harness mechanism. The conventional parts of the harness frames 5.

mechanism include the harness These frames are positioned one in front of the other and extend widthwise of the loom in substantially parallel vertical planes. The harness frames are moved vertically to form' the shed opening, as is well known in the art. To this end, the harness frames may be connected to the forward ends of harness treadles 6 -(of novel construction) by any suitable usual connections such as straps S.

The treadles ,6 extend forwardly and rearwardly of the loom, approximately horizontally, with their forward ends located below the harness frames 5, there being one treadle for each The treadles are fulcrumed adharness frame.

jacent their rearward ends, as Will be described, and are operated by the usual harness cams 1. The harness cams are fixed on a shaft 8 which is located rearwardly of the planes of the bar:- ness frames and above the treadles 6 intermedi The shaft 8 is driven The revolving ate the ends of the latter. from the cam shaft 4 as usual.

cams I engage rolls 9 on the treadles and oscillate the latter vertically.

The size of the shed opening formed by the harness frames must vary with different weaving conditions, and, to avoid changing the harness cams, it is desirable that the throw of the treadles 6 be adjustable by other means.

It is also desirable, under some circumstances, that the throw of the individual treadles vary uniformly, so that the vertical movement of the treadle connected to the front harness frame be less than movement of the treadles connected to other harness frames by an amount necessary to provide a uniform shed opening. It is further desirable that the treadles be firmly supported and guided. All of these results are accomplished in the embodiment illustrated.

In order to support the treadles 6 against undesired movement, I support them at two 1ongitudinally spaced points. As shown, each treadle has a substantially flat longitudinal surface Iii which comprises the upper side of a slot I l. surface I!) rests on a fulcrum member l2 which may consist of a bar extending transversely of the treadles through the slots H in all of the treadles. The slots and fulcriun member are located in the rearward portions of the treadles, on the opposite side of the cams I from the harness frames. Additional support for the treadles is provided by guide means preferably in the form of a fixed guide rod l3. Each treadle 6 is provided at its extreme rearward end with a slot I4 which is arcuate and the center of which substantially coincides with the top or fulcrum surface of the bar It. The rod i3 extends transversely of the treadles through the slots l and the ends of the rod are fixed in brackets l5 on the girt 2.

The two longitudinally spaced supporting and guiding means in this embodiment are, therefore, the bar 12 and the guide rod 13. The slots I4 are of such a length and are so located that the rod l3 never contacts the encs of the slots. However the width of the slots is such as to accurate- 1y guide the treadles and prevent the latter from moving longitudinally.

Adjustment of the throw of the treadles 6 is accomplished by adjusting the fulcrum member [2 longitudinally of the treadles, along the surface In. To this end, the member l2 may be adjustably supported in the brackets l5. As shown, the ends of the fulcrum member extend through horizontal slots I6 in the brackets I5. Each of said ends is pivoted at IT to a block is which is adjustably fixed to the bracket [5 by a bolt l9. Each block [8 is adjustable forwardly and rearwardly of the loom, to move the corresponding end of member I2 along its slot !6.

It will be apparent that by loosening the bolts I9 and sliding both blocks l8 forwardly or rearwardly the fulcrum member will be moved along the surfaces l0 to thereby increase or decrease the throw of the treadles as desired. This adjustment is quickly and easily effected, and fulfills most weaving requirements. However, the supporting and adjusting means comprising brackets l5 and blocks I8 are arrangedto provide the above mentioned variation in the throw of the individual treadles, which is necessary under some conditions. To effect this variation one block 18 is so adjusted relative to the other block that the fulcrum member [2 extends at an acute angle to the treadles, as shown by Fig. 5, rather than at right angles thereto as in Fig. 2.

Fig. 4 shows a second embodiment wherein treadles 20 are positioned in the loom and connected to harness frames as before and are 01)- erated by the same cams I. In this embodiment, the longitudinal fulcrum-engaging surface 2| comprises the upper side of a slot 22 located at the extreme rearward end of the trea- The dle, and the fulcrum member 23 is accordingly located rearwardly from the guide rod 24. This guide rod extends transversely of the treadles through arcuate slots 25 as in the first embodiment, but the slots 25 are curved rearwardly to locate their center at the fulcrum surface on member 23. Supporting and adjusting means for the member 23 and guide rod24 may be similar to those above described and may provide the same adjustments. Such means for this em- 1 bodiment are accordingly not illustrated or described.

Having fully disclosed the preferred embodiments of myinvention, I claim:

1. In a loom, a harness frame, a harness treadle connected with said harness frame for operating the latter, a cam for operating said treadle, a fixed fulcrum member, said treadle having a substantially flat surface extending longitudinally of the treadle and bearing on said fulcrum member, and guide means comprising a fixed stand'and a pin and slot connection between said stand and said treadle for preventing the latter from moving longitudinally, the slot of said connection being arcuate and the center thereof substantially coinciding with the fulcrum point of said fulcrum member.

2. In a loom, a harness frame, a harness treadle, means connecting one end of said treadle with said harness frame for operating the latter, a cam acting on said, treadle intermediate he ends thereof, a fixedfulcrum member located at the opposite side of said cam from said connecting means, said treadle having a substantially fiat longitudinal surface resting on said.

fulcrum member, a fixed stand, and a pin and slot connection between said stand and said treadle for preventing the latter from moving longitudinally, the slot of said connection being curved on an arc the center of which substana plurality of treadles extending forwardly and rearwardly of the loom with their forward ends beneath said harness frames, means connecting the forward ends of said treadles with said harness frames, harness cams acting on said treadles intermediate the ends thereof, a fixed fulcrum bar. extending transversely of said treadlesrearwardly of said cams, each of said treadles having a longitudinal bearing surface resting on said bar,

each of said treadles having an arcuate slot the center of which substantially coincides with the axis of said bar, and a fixed guide rod extending through said .slots to prevent longitudinal movement of said treadles.

4. Ina loom, a harness frame, a harness treadle, means connecting one end of said treadle with said harness frame, a cam acting onsaid treadle intermediate the ends thereof, a fulcrum meming said fulcrum member for adjustment longitudinally of the treadle along said surface to thereby adjust the throw of the treadle, means for fixing-said fulcrum member in adjusted posi tion, and guide means engaging said treadlefor preventing longitudinal movement thereof.

5. In a loom, a substantially vertical harness iii] Al." bearing on said fulcrum member, means supportframe, a harness treadle extending forwardly and rearwardly'of the loom with its forward end p01- sitioned beneath said harness frame, means connecting said forward end with said harness frame, a harness cam acting on said treadle intermediate the ends thereof, a fulcrum bar extending transversely of said treadle adjacent the rearward end thereof, said treadle having a substantially flat longitudinal surface bearing on said bar, means supporting said bar for adjustment forwardly and rearwardly of the loom along said surface, means for. fixing said bar in adjusted position, and fixed guide means spaced longitudinally of the treadle from said fulcrum bar and engaging said treadle for preventing longitudinal movement thereof.

6. In a loom, a harness frame, a harness treadle extending forwardly and rearwardly of the loom and having its forward end positioned beneath said harness frame, a harness cam acting on said treadle intermediate the ends of the latter, a fulcrum member on which the rearward portion of said treadle rests and about which said treadle rocks, means supporting said member for adjustment forwardly and rearwardly along said treadle to change the throw of thetreadle, means for fixing said member in adjusted position, said treadle having an arcuate slot the center of which substantially coincides with the mid-position of said fulcrum member, and a fixed guide member engaging in said slot to prevent said treadle from moving longitudinally.

7. In a loom, a plurality of harness frames positioned in substantially parallel vertical planes, a plurality of harness treadles extending forwardly and rearwardly of the loom and having their forward ends positioned beneath said harness frames, means connecting said forward ends with said harness frames, harness cams acting on said treadles intermediate their ends, each of said treadles having a longitudinal slot rearwardly of said harness cams, a fulcrum bar extending transversely of said treadles through all of said slots, means supporting said bar for adjustment forwardly and rearwardly of the loom along said slots to thereby vary the throw of said treadles,

each of said treadles having an arcuate slot the center of which substantially coincides with the mid-position of said'bar, and a fixed guide rod extending transversely of the treadles through said arcuate slots for preventing said treadles from moving longitudinally.

8. In a loom, a plurality of harness frames, a plurality of harness treadles for operating said harness frames, harness ,cam's acting on said treadles for operating the latter, a single fulcrum member extending transversely of said treadles, each of said treadles having a substantially fiat longitudinal surface bearing on said fulcrum member, means supporting the ends of said fulcrum member for separate adjustment longitudinally of said treadles along said surfaces to various acute angles to the treadles, to thereby adjust the relative throws of the various treadles, means for fixing said fulcrum member in adjusted position, and means spaced from said fulcrum member for guiding said treadles and preventing the same from. moving longitudinally.

9. In a loom, a plurality of substantially vertical harness frames, a plurality of harness treadles positioned side by side and extending forwarclly and rearwardly of the loom below said harness frames, means connecting the forward ends of said treadles with said harness frames, harness cams acting on said treadles intermediate the ends thereof, each of said treadles having a longitudinal slot in its rearward portion, a fulcrum 'bar extending transversely of said treadles through said slots, means supporting the ends of said bar for separate adjustment along said slots to various acute angle positions relative to said treadles, to thereby adjust the relative throws of the various treadles, means for fixing the ends of said bar in adjusted position, each of said treadles having an arcuate slot the center of which substantially coincides with the mid-position of said bar, and a fixed guide rod extending through said arcuate slots for preventing said treadles from moving longitudinally.

I CARL D. BROWN. 

